https://doi.org/10.1140/epjp/s13360-022-03093-9
Regular Article
Photoionization cross section of a 
complex in quantum dots: the role of donor atoms configuration
1
Faculty of Science, Physics Department, Sivas Cumhuriyet University, 58140, Sivas, Turkey
2
Faculty of Education, Department of Mathematics and Natural Science Education, Sivas Cumhuriyet University, 58140, Sivas, Turkey
3
Faculty of Science, Physics Department, Dokuz Eylul University, 35390, Izmir, Turkey
Received:
3
June
2022
Accepted:
18
July
2022
Published online:
13
August
2022
This study reports a theoretical investigation on the electronic spectrum and the photoionization cross section of a singly ionized double donor complex confined in a two-dimensional quantum dot with Gaussian confinement potential. Using the diagonalization method and the effective mass approach, the energy spectrum, binding energy, and photoionization cross section of the complex were obtained for different quantum dot sizes and internuclear distances. The numerical results obtained reveal that the size of the geometric confinement and the configuration of the donor atoms significantly affect the binding energy, equilibrium distance and photoionization cross section of the complex. As a result, the electronic spectrum and optical responses of the artificial molecule complex can be fine-tuned simply by controlling the confinement size and impurity configuration. Also, we conclude that a significant increase in the amplitude of the photoionization cross section is observed when the donor atoms are symmetrically positioned on the x-axes. In addition, the exact convergence of the results obtained in the limiting case to the known results demonstrated the suitability of the method used in this study.
I. Sökmen: Retired.
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